TXX-6459, Interim Deficiency Rept CP-86-22 Re Capacity of Present Fan Cooler Design in Safeguards Area to Adequately Handle Heat Load in Several Rooms.Initially Reported on 860402. Evaluation Continuing.Next Rept Expected by 870708
| ML20214H966 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 05/20/1987 |
| From: | Counsil W, John Marshall TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-86-22, TXX-6459, NUDOCS 8705270562 | |
| Download: ML20214H966 (2) | |
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Log # TXX-6459 FE File # 10110 1
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909.4
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Ref, #.10CFR50.55(e) nlELECTRIC May 20, 1987 Emntin Vlw I'vesidem U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C.
20555-i
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) i DOCKET NOS. 50-445 AND 50-446 i
SAFEGUARDS AREA FAN COOLERS SDAR: CP-86-22 (INTERIM REPORT) 4 j
Gentlemen:
j On Aoril 2,1986, we verbally notified your Mr. T. F. Westerman of a i
deficiency involving the capacity of the present fan cooler design.in the 2
Safeguards area to adequately handle the heat. load in several rooms. This is an interim report of a potentially reportable item under the provision of 4
10CFR50.55(e). We have submitted interim reports logged TXX-4780, TXX-4894, TXX-5008, and TXX-6158 dated April 30, 1986, July 3, 1986, September 12, 1986, i
and December 12, 1986, respectively.
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During a review of Unit 2 preoperational test procedures, a comparison of fan cooler specifications and drawings identified cooling capacities below the calculated heat loads in the design basis calculation. Test performance data i
for Unit I coolers may have been-accepted at values below both the design heat loads and equipment capacities.
In order to assess the impact of this condition on the safety of plant operations, an engineering evaluation was undertaken to determine if failure of equipment cooling capacities to meet required design criteria could result i
in an inability of associated safety-related systems to perform as required following LOCA with loss of offsite power.
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The completed calculations for Unit I have determined-that the emergency fan i
coolers-(served by the safety chilled water system) are adequately sized to j
maintain the room temperatures, within the FSAR requirements, following a'LOCA 1
coincidental with loss of offsite power.
However, we have determined that the j
chilled water flow rates require rebalancing.
71 ano N rth olive street i n. 81 Dallas, lexas 75201 8705270562 870520 PDR ADOCK 050004454 xm
e TXX-6459 May 20, 1987 Page 2 of 2 We are continuing with our evaluation which includes revising the design documents as indicated above. We expect to submit our next report by July 8, 1987.
Very truly yours, N d bunsid W. G. Counsil
[/fd-+Isb By:
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- 3. S. Marshall Supervisor, Generic Licensing i
GLB/gj c - Mr. R. D. Martin - Region IV Mr. D. L. Kelley, RI - Region IV
'fr. H. S. Phillips, RI - Region IV 4
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